Talk about the measuring principle of the tensile testing machine

Tensile testing machine is also known as material testing machine
.

The testing machine is used for various materials for the static loading, tensile, compression, bending, shearing, tearing, peeling and other mechanical properties of mechanical properties of the mechanical properties of the testing machine for mechanical force, suitable for plastic sheets, pipes, profiles, plastic films and rubber, wire and cable, steel, glass fibers and other materials of various physical and mechanical properties testing for material development, for physical testing, teaching and research, quality control and other testing equipment, tensile machine fixtures as an important part of the instrument, Different materials require different fixtures, which is also an important factor
in whether the test can be carried out smoothly and the accuracy of the test results.

Measuring principle 1, the measurement of the force value of the tensile testing machine is measured by the load cell, the expander and the data disposal system
.

From the data mechanics, it is known that under the premise of small deformation, the strain ε of a certain point of an elastic element is proportional to the force subjected to the elastic element, and it is also proportional to
the change of elasticity.

Taking the S-type testing machine sensor as an example, when the sensor is subjected to the effect of tensile force P, because the surface of the elastic element is pasted with a strain gauge, because the strain of the elastic element is proportional to the size of the external force P, the strain gauge is inserted into the measurement circuit, and its output voltage can be measured, and then the force is measured
.

2.
The measurement of deformation is measured by deformation measurement installation, which is used to measure the deformation
of the specimen in the experimental process.

There are two chucks on the installation, which are connected by a series of biographical ideas and the photoelectric encoder installed on the top of the measurement installation, and when the interval between the two chucks changes, the axis of the photoencoder is twisted, and the photoencoder will have a pulse flag light output
.

The disposing of this flag lamp by the disposer can then obtain the amount of deformation of the specimen
.

3.
The measurement of beam displacement is roughly the same as the deformation measurement, which is to obtain the displacement of
the beam by measuring the output pulse number of the photoelectric encoder.